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The secrets of mother-of-pearl strength

The secrets of mother-of-pearl strength

Do you know that the nacre layer, or mother-of-pearl, which is found in pearls and abalone shells is 3,000 times more fracture-resistant than aragonite, the mineral of which it is composed? According to researchers at University of Wisconsin-Madison, this remarkable strength "is due to well-defined nanolayers of organics at the interfaces between micro-tiles of aragonite." "You can go over it with a truck and not break it -- you will crumble the outside [of the shell] but not the [nacre] inside. And we don't understand how it forms -- that's why it's so fun to study," said the lead researcher. But if becomes possible to harness the mechanism of formation of nacre, it would be possible to produce cars that absorb all the energy at the impact point but do not fracture.

July 3, 2007 by